Solve the problem of excessive server memory resource consumption caused by too many php-fpm processes in CentOS7

Foreword:

The server memory usage has been high recently. After checking, it was found that it may be related to the excessive number of php-fpm processes. This article records my process of optimizing the php-fpm configuration file and adds some knowledge related to php-fpm.

What is php-fpm:

php-fpm is the FastCGI process manager, used to control php's memory and processes.

Operating environment:

CentOS 7

Problem check:

First check the total number of php processes:

pstree|grep php-fpm

Echo:

|-php-fpm---20*[php-fpm]

According to the echo information, there are 20 php-fpm processes during the query.

You can also list the top 50 processes that consume the most memory through the following command:

ps auxw|head -1;ps auxw|sort -rn -k4|head -50

Solution process:

Let’s modify the configuration below file to optimize php-fpm to reduce memory usage.

My php-fpm configuration file is in the .../server/php/etc/ directory, enter this directory.

Back up the original configuration file first:

cp php-fpm.conf php-fpm.conf.bak

Note:

After using vim to open the configuration file, press the Esc key, and then enter "/" , then enter "xxx" to search for the string "xxx".

The specific configuration parameters are as follows:

pm.max_children = 100改为：pm.max_children = 25
pm.start_servers = 20改为pm.start_servers = 5
pm.min_spare_servers = 5改为pm.min_spare_servers = 2
pm.max_spare_servers = 35改为pm.max_spare_servers = 10

Restart the server:

reboot

After restarting, you can find that the memory usage is lower than before.

Note:

1. Description of the parameters in php-fpm.conf:

pm.max_children：静态方式下开启的php-fpm进程数量。
pm.start_servers：动态方式下的起始php-fpm进程数量。
pm.min_spare_servers：动态方式下的最小php-fpm进程数。
pm.max_spare_servers：动态方式下的最大php-fpm进程数量。

2. When making the above settings, I will php -The execution mode of -fpm is set to dynamic:

pm = dynamic

3.php-fpm has two execution modes:

One is Static and the other is Dynamic. If set to static, only the pm.max_children parameter will take effect. If set to dynamic, the three parameters pm.start_servers, pm.min_spare_servers and pm.max_spare_servers will take effect. After setting it to dynamic, when php-fpm starts, it will start the corresponding number of processes according to the parameter setting of pm.start_servers. After that, the number of processes of php-fpm will be maintained between the number specified by pm.min_spare_servers and pm.max_spare_servers.

4. How to choose to use the static or dynamic execution mode of php-fpm:

The dynamic php-fpm execution mode allows php-fpm to release redundant processes, thus saving memory resources.

The static php-fpm execution method does not allow php-fpm to release more than processes, which avoids frequently starting or stopping the php-fpm process, thereby reducing the server's response time in some cases.

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